Question

我正在开发一个Android应用程序，我想从WebService获取一些数据。我正在使用此代码从WebService获取JSON数据。

    TextView textv=(TextView) findViewById(R.id.textv);

    try {
        HttpClient client = new DefaultHttpClient();  
        String URL = "http://server/WebService.asmx/Get_ActiveFair";
        HttpPost post = new HttpPost(URL);

        post.setHeader("Content-Type", "application/json; charset=utf-8");
        HttpResponse responsePost = client.execute(post);
        HttpEntity resEntityPost = responsePost.getEntity();  
        if (resEntityPost != null) 
        {
            String response=EntityUtils.toString(resEntityPost);
            Log.e("XXX",response);
            textv.setText(response);
        }
    } catch (Exception e) {
        e.printStackTrace();
        textv.setText(e.toString());
        Log.e("error!!",e.toString());
    }

它正常工作我得到这样的数据：

     {
        "d": "{\"Id\":2,\"Name\":\"Fair Name \",\"IsActive\":true,\"Date_Start\":\"\\/Date(1383343200000)\\/\",\"Date_End\":\"\\/Date(1384034400000)\\/\",\"Url_Map\":null,\"Details\":\"Fair Details \",\"Address\":\"FairAdress \",\"VisitingInfo\":\"Fair Visiting Info\",\"Contact\":null,\"Transportation\":\" Fair Transportation Info \"}"
     }

但是当我想在webservice中使用另一个需要获取FairId的方法时，我得到了结果：

     {
        "Message": "Invalid JSON primitive: FairId.",
        "StackTrace": "   at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializePrimitiveObject()\r\n   at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializeInternal(Int32 depth)\r\n   at System.Web.Script.Serialization.JavaScriptObjectDeserializer.BasicDeserialize(String input, Int32 depthLimit, JavaScriptSerializer serializer)\r\n   at System.Web.Script.Serialization.JavaScriptSerializer.Deserialize[T](String input)\r\n   at System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext context, WebServiceMethodData methodData)",
        "ExceptionType": "System.ArgumentException"
     }

这是运行Get_EventList方法的代码：

    TextView textv=(TextView) findViewById(R.id.textv);

    try {
        HttpClient client = new DefaultHttpClient();  
        String URL = "http://server/WebService.asmx/Get_EventList";
        HttpPost post = new HttpPost(URL);

        List<NameValuePair> postParameters;
        postParameters = new ArrayList<NameValuePair>();
        postParameters.add(new BasicNameValuePair("FairId", "2"));
        post.setEntity(new UrlEncodedFormEntity(postParameters));

        post.setHeader("Content-Type", "application/json; charset=utf-8");
        HttpResponse responsePost = client.execute(post);
        HttpEntity resEntityPost = responsePost.getEntity();  
        if (resEntityPost != null) 
        {
            String response=EntityUtils.toString(resEntityPost);
            Log.e("XXX",response);
            textv.setText(response);
        }
    } catch (Exception e) {
        e.printStackTrace();
        textv.setText(e.toString());
        Log.e("hata!!",e.toString());
    }

可能是什么问题？我该如何解决？

Answer 1

我通过FairId向JSONObject发送TextView textv=(TextView) findViewById(R.id.textv); try { HttpClient client = new DefaultHttpClient(); String URL = "http://server/WebService.asmx/Get_EventList"; HttpPost post = new HttpPost(URL); JSONObject json = new JSONObject(); json.put("FairId", "2"); StringEntity se = new StringEntity( json.toString()); se.setContentType(new BasicHeader(HTTP.CONTENT_TYPE, "application/json")); post.setEntity(se); HttpResponse responsePost = client.execute(post); HttpEntity resEntityPost = responsePost.getEntity(); if (resEntityPost != null) { String response=EntityUtils.toString(resEntityPost); Log.e("XXX",response); textv.setText(response); } } catch (Exception e) { e.printStackTrace(); textv.setText(e.toString()); Log.e("hata!!",e.toString()); }来解决问题。这是我的新代码：

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尝试从WebService获取数据时出现“无效的JSON原语”错误

1 个答案: